If you want to grep for a pattern beginning with a hyphen, use
-- before the pattern you specify.
man find | grep -- -type
If you want more info, for example the entire section describing an option, you could try using Sed:
$ man find | sed -n '/-mindepth/,/^$/p'
Do not apply any tests or actions at levels less than levels (a
non-negative integer). -mindepth 1 means process all files
except the command line arguments.
However, this won't work for every option you might search for. For example:
$ man find | sed -n '/^[[:space:]]*-type/,/^$/p'
File is of type c:
Not very helpful. Worse, for some options you could be misled into thinking you'd read the whole text about the option when you really hadn't. For example, searching
-delete omits the very important WARNING contained as a second paragraph under that heading.
My recommendation is to use a standard call to
man with the
LESS environment variable set. I use it quite commonly in my answers on this site.
LESS='+/^[[:space:]]*-type' man find
To learn more about how this works, see:
LESS='+/^[[:space:]]*LESS ' man less
LESS='+/\+cmd' man less
LESS='+/\/' man less
If you just want to find the option quickly and interactively in the man page, learn to use
less's search capabilities. And also see: